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<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 通过给父盒子添加flex属性来达到控制子盒子位置和排列方式 */
        div{
            display: flex;
            width: 80%;
            height: 300px;
            background-color: pink;
            justify-content: center;
        }
        div span{
            /* width: 160px; */
            height: 150px;
            background-color: blue;
            margin-right: 5px;
            flex: 1;
        }
    </style>
</head>
<body>
    <div>
        <span>1</span>
        <span>2</span>
        <span>3</span>
    </div>    
</body>
</html>